The striations (lines) of skeletal muscles are caused by the arrangement of many elongated ________
Fill in the blank(s) with correct word
myofibrils
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Which of the following hormones increases blood pressure by directly stimulating the distal convoluted tubule and collecting ducts to take up more water and salts?
A. aldosterone B. angiotensin II C. antiotensin I D. renin E. antidiuretic hormone
All of the following statements about cellulose are true EXCEPT:
A. Cellulose is composed of fibers of carbohydrates. B. Cellulose is an important source of plant fiber for our diet. C. Cellulose is the primary molecule found in wood. D. Cellulose is one of the most abundant organic molecules on Earth. E. Certain animals like ourselves can easily digest cellulose and use it as a source of energy.
Glucagon raises blood glucose levels by:
a. stimulating the liver to take up glucose. b. inhibiting gluconeogenesis. c. stimulating gluconeogenesis. d. inhibiting fatty acid mobilization. e. inhibiting amino acid mobilization
A hybrid zone is properly defined as _____
A) an area where the ranges of two closely related species overlap, but do not interbreed B) an area where mating occurs between members of two closely related species, producing viable offspring C) a zone where sterile hybrids form, kept separate by postzygotic barriers D) an area where members of two closely related species intermingle, but gene flow is prevented by prezygotic barriers